Ticket #47773 - mem leak in do_bind when there is an error
    
    https://fedorahosted.org/389/ticket/47773
    Reviewed by: nhosoi (Thanks!)
    Branch: 389-ds-base-1.3.2
    Fix Description: Do not get the SLAPI_BIND_TARGET_SDN from the pblock and
    free it in the clean up code if it was never set in the pblock - just free
    the local variable sdn in this case.
    Platforms tested: RHEL6 x86_64
    Flag Day: no
    Doc impact: no
    (cherry picked from commit 2a57b521b86b24c0f0a8ddfbea4169c71ee4e896)